895132-IL Просмотр технического описания (PDF) - Atmel Corporation

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895132-IL

USB Microcontroller with 64K Bytes Flash Memory

Atmel Corporation 

7.3.4

Preventing Flash Corruption

See “Reset Recommendation to Prevent Flash Corruption” on page 45.

7.4 Registers

Table 6. AUXR1 Register

AUXR1 (S:A2h) – Auxiliary Register 1

7

6

5

4

3

2

-

-

ENBOOT

-

GF3

0

1

0

-

DPS

Bit

Bit Number Mnemonic Description

7-6

-

Reserved

The values read from these Bits are indeterminate. Do not set these Bits.

Enable Boot Flash

5

ENBOOT

Set this bit to map the boot Flash in the code space between at addresses F000h to

FFFFh.

Clear this bit to disable boot Flash.

4

-

Reserved

The values read from this bit is indeterminate. Do not set this bit.

3

GF3

General Flag

This bit is a general-purpose user flag.

2

0

Always Zero

This bit is stuck to logic 0 to allow INC AUXR1 instruction without affecting GF3 flag.

1

-

Reserved for Data Pointer Extension.

Data Pointer Select Bit

0

DPS

Set to select second data pointer: DPTR1.

Clear to select first data pointer: DPTR0.

Reset Value = XXXX 00X0b

7.5

Hardware Bytes

Table 7. HSB Byte – Hardware Security Byte

7

6

5

4

3

X2B

BLJB

-

-

-

2

1

0

LB2

LB1

LB0

Bit

Bit Number Mnemonic Description

X2 Bit

7

X2B(1) Program this bit to start in X2 mode.

Unprogram (erase) this bit to start in standard mode.

Boot Loader Jump Bit

6

BLJB(2) Program this bit to execute the boot loader at address F000h on next reset.

Unprogram (erase) this bit to execute user’s application at address 0000h on next reset.

5-4

-

Reserved

The value read from these bits is always unprogrammed. Do not program these bits.

Reserved

3

-

The value read from this bit is always unprogrammed. Do not program this bit.

20 AT89C5132

4173E–USB–09/07

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